What does a blue screen do in movies?

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Tags

1. #common
2. #industry
3. #visual
4. #where
5. #weather
6. #using
7. #entertainment
8. #movies
9. #added
10. #color
11. #parts
12. #screen
13. #keying
14. #different
15. #image
16. #games
17. #video
18. #effects
19. #chroma